Note 4 - Investment in Limited Liability Company (Details Textual)		3 Months Ended	9 Months Ended	38 Months Ended
Aug. 08, 2017 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Income (Loss) from Equity Method Investments, Total		$ (55,000)	$ (168,000)	$ (323,000)	$ (431,000)
InControl Medical [Member]
Equity Method Investment, Ownership Percentage		7.00%		7.00%		7.00%
Income (Loss) from Equity Method Investments, Total		$ (55,000)	$ (168,000)	$ (323,000)	$ (431,000)
InControl Medical [Member] \| Membership Unit Subscription Agreement [Member]
Unrecorded Unconditional Purchase Obligation, Period Quantity Purchased		185	0	425	300	5,225
Unrecorded Unconditional Purchase Obligation, Purchases		$ 26,000	$ 0	$ 46,000	$ 27,000
Payments for Purchase of Products		10,000	$ 0	30,000	$ 27,000
Accounts Payable, Related Parties, Current		$ 16,000		$ 16,000		$ 16,000	$ 0
Payments to Acquire Equity Method Investments	$ 2,500,000

Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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